Originally Posted by
beatsal
When I unscrew the compression screw, it seems as if it is free i.e. when I tighten the screw it reaches a point where cannot tighten further. Now, when I loosen from that point, it is free as if not connected to anything.
When you back the compression screw off, flipping the engine over a few times should push the contrapiston back up. The compression screw and contrapiston are not connected/attached to each other. If the contrapiston does not move back up after backing the compression screw off, it’s probably stuck due to gummy oil. It needs to be freed up by someone experienced with diesels. If you mess it up, you’re replacing the head, contrapiston, or both.
I
HIGHLY suggest getting with someone that knows how to run a diesel to help you. Otherwise you will ruin the engine in short order. I’m pretty sure this has already been mentioned, so heed that sound advice.